Final answer:
Those who participate in regular exercise benefit the most from acute exercise when it comes to improving total sleep time and quality. The correct option is (1).
Step-by-step explanation:
In terms of improving total sleep time and quality, the group that benefits the most from acute exercise is those who participate in regular exercise. Research shows that physical exercise generally improves sleep for most people, including those with sleep issues or disorders like insomnia.
The optimum time to exercise for sleep benefits is four to eight hours before bedtime, although exercise at any time of day seems to be beneficial.